Profitability of dairy cow production is influenced by good health condition of animals. Productive disorders (PD) resulting from improper technological systems of housing, inadequate nutrition and feeding regimens or improper milking system represent a serious problem. PD are associated with a significant reduction of milk quality and milk yield. Preventive system (PS) ofPD is very important a...

Alkaline/surfactant/polymer (ASP) flooding has been extensively applied to enhancing oil recovery. As an oil displacement agent, pe1troleum sulfonate (PS) is widely used in ASP pilot experiments. It is very important to find a petroleum sulfonate with a high interfacial activity and low adsorption loss. Anionic surfactant petroleum sulfonate is synthesized in a single-tube film sulfonation reac...

Within the Institute of Electrical and Electronics Engineers, Inc. (IEEE), the IEEE 802 LAN MAN Standards Committee is developing air interface standards for wireless local area network (LAN), wireless metropolitan area network (MAN), and wireless personal area network (PAN) technology. These standards are enabling the development of an infrastructure for the Wireless Internet. This article was...

objective: this research aims to investigate the correlation between ergonomics conditions and job burnout among librarians in the university of isfahan. methodology: the research method is descriptive correlation study. the research data was collected by maslash burnout inventory for determining job burnout among librarians and checklist of standards and principles of ergonomics for evaluation...